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Level 1

22 points

M1 Macbook air external display issues with usb-c

My M1 MacBook air is having issue when connecting to my 4k Asus pa279cv display over usb-c to usb-c cable directly to the usb-c DisplayPort, but it is okay when connecting to HDMI port with usb-c hub.

The monitor supports 65w and DisplayPort 1.2 and it should be fine as I tested it with with 2016 MacBook Pro 13" and 2020 Intel MacBook air.

So I start to guess it would be the m1 issue and I reserved Genius Bar to fix my computer.

However it just fine when plugin to the LG 5k Display in the apple store.

After that, I tested it again at home.

I notice that it pops up a message "Unplug the accessory using too much power to re-enable USB devices", but my monitor is charging up the Mac properly.

Lastly, I found that it is occasionally work with the usb-c to usb-c cable to the monitor.

And it could not connect again when the the Mac disconnected with the monitor.

I am frustrated with the situation, and my Mac just arrived serval days.

MacBook Air

Posted on Dec 4, 2020 7:07 AM

Best reply

hotinyip

Level 1

9 points

Posted on Dec 12, 2020 1:24 AM

Exactly the same situation with you, and probably I could help you.

I just bought a brand new m1 MacBook Air and Asus PA279CV. At first, I found the same issue with you in which when I plugged in the usb-c cable to the MacBook, the monitor showed nothing, but it could charge my MacBook. Then I found that, if you shut down your MacBook, then plug in the usb-C cable, then open you MacBook, and you will find the monitor works properly (showing the visual and charging your MacBook at the same time). I don't know why it has to close the MacBook first before plugging in the cable (it is quite not convenient when you are working and want to plug in the cable to continue your job at external monitor), but it is the solution that I can find at this moment.

Hope it helps.

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M1 Macbook air external display issues with usb-c

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